Composite metal article and method of making same



Jan. 31, 1933. D BAGLEY 1,895,533

COMPOSITE METAL ARTICLE AND METHOD OF MAKING SAME Filed Oct. 7, 1929ATTORNEY Patented Jan. 31, 1933 UNITED STATES PATENT OFFICE- GLEN ID,BAGLE'Y, OF GREAT N EGK, NEW YORK, ASSIGNOR TO ELECTRO METALLURGICALCOMPANY, A CORPORATION OF WEST VIRGINIA COMPOSITE METAL ARTICLE ANDMETHOD OF MAKING SAME Application filed October 7, 1929. Serial No.397,971.

My invention relates to a composite metal article having a hard exteriorand a softer core, and a method of making the article in which the corein preformed, and molten metal is poured around the core.

It is often desirable that the rim or outer surface of articles suchas'car wheels and metal rolls for rolling out or crushing hard materialsshould'be formed of hard cast unmachineable metal, and the interior orcore of these articles be formed of a softer machineable metal. Afterthe casting is made, a bore in the core .of the article may be ma chinedand ground, and the article may be driven or shrunk upon a shaft. Thesurface of the article may then be ground as required.

In the manufacture of such articles, it is important that a firm unionbe made between the rim metal and the core metal. To accomplish thisresult it is economically important that the rim metal be cast incontact with the core metal. As is well known, cast ferrous metal uponcooling from the molten state contracts, and provision must be madeforthe free contraction of the metal in order to avoid detrimental internalstresses being set Therefore, the principal object of my in vention isto cast a rim of unmachineable to freely contract with the metal rim.

Other objects of my invention will be understood from the following.description and accompanying drawing in which:

Fig. I is an end view of a roll and Fig. II is a section through Fig. Ion line IIII.

According to my invention, a rim of metal 1 adapted to becomeunmachineably hard upon cooling is cast around a metal core 2 'made in radial'sections 3. A plurality of lugs 4 are welded to the outside ofeach section ofthe core. These lugs become embedded in the cast rim ofthe roll when the rim metal is-poured around the core as shown L indotted lines in Fig. I. The sections 3 of the 'core are spaced apart andare yieldably held together by strips of metal 5 bridging the spaces andwelded to the sections on Opposite sides of the spaces. A thinlongitudinal sheet 50 of metal 6 covers each of the openings bemetalaround a preformed metal core adapted tween the sections 3 and eachsheet is welded at points along one of its edges to a single section.

The core 2 thus assembled is placed in the center of a mold and the rimmetal 1 is poured around the core. The longitudinal sheets 6 coveringthe openings between the sections 3 retain their form sufficiently toprevent the. cast rim metal 1 from running through the openings. \Vhenthe rim metal 1 cools, it contracts and decreases the space between thesections 3, and the securing strips 5 yield to permit free contractionand thus prevent stresses from being set up in the rim metal.

, After the casting has cooled, it may then be machined on the-interiorof its core to the proper dimensions for mounting on a shaft. The pins 4welded to the exterior perimeter of the core 2 bind the sections of thecore securely to the rim metal 1 and permits the roll to be driven on oroff a shaft by hammering the rim metal.

\Vhile I have shown only one form of my invention, other modificationsor changes may be made without departing from the scope of my inventionas defined in the appended claims.

' I claim:

1. A method of making a composite article having a hollow core of softmetal and an outer portion of harder metal, comprising; forming saidcore by providing a plurality of radial segments, welding a plurality oflugs to the outside of each of said segments, and placing said segmentsin a mold in the form of a circle with the adjacent edges thereof spacedapart; and pouring said harder metal, while molten, in said mold aroundsaid core.

2. A method of making a composite article 90 having a hollow core ofsoft metal and an outer portion of harder metal, comprising; formingsaid core by providing a plurality of radial segments, welding aplurality of lugs to the outside of each of said segments, placing saidsegments in the form of a circle with the adjacent edges thereof spacedapart, covering each space between said segments with a sheet of metal,and welding each of said sheets to one of said segments; placing saidcore in a mold; and pouring said harder metal, while molten, in saidmold around said core.

3. A method of casting metal around a preformed sectional core to unitethe core and the cast metal comprising spacing the sections of the coreapart, bridging the spaces with yieldable metal strips welded to asection on each side of the space; placing the welded core in a mold andpouring molten metal about the core.

4. A method of making a composite article having a hollow core ofsoftmetal and an outer portion of harder metal, comprising; forming saidcore by providing a plurality of segments, welding a plurality of lugsto the outside of each of said segments, placing said segments in theform of a circle with the adjacent edges thereof spaced apart, andwelding a plurality of yieldablc strips to both of each pair of saidadjacent edges; placing said core in a mold; and pouring said hardermetal,

while molten, in said mold around said core.

5. A method of making a composite article having a hollow core of softmetal and an outer portion of harder metal, comprising; forming saidcore by providing a plurality of segments, welding a plurality of lugsto the outside of each of said segments, placing said segments in theform of a circle with the adjacent edges thereof spaced apart, coveringeach space between said segments with a sheet of metal, welding each ofsaid sheets to one of said segments, and welding a plurality ofyieldable strips to both of each pair of said adjacent edges; placingsaid core in a mold and pouring said harder metal, while molten, in saidmold around said core.

6. A composite metal article comprising a core having its perimeterdivided into a plurality of sections joined by. yieldable strips and anouter surface of cast material around said core.

7. A composite metal article comprising a core having its perimeterdivided into a plurality of radial sections joined by yieldable strips,projections on each section extending from the outer perimeter, and anouter surface of cast material around said core.

8. Composite metal article comprising a metal core having a plurality ofspaced apart sections, strips of metal extending across said spaces andattached to said sections on the opposite side of said spaces, and acylindrical layerof wear-resistant cast metal around said core.

9. Composite metal article comprising a metal core having a plurality ofspaced apart radial sections having projections extending from theoutside of said sections, and strips of metal extending across saidspaces and welded to said sections on the opposite side of said spaces,and a cylindrical layer of wearresistant cast metal around said core.

10. Composite metal article comprising a In testimony whereof, I aflixmy signature.

GLEN D. BAGLEY.

